It's a Boy Girl Thing (2006)

if you get over the fact that the human body neglects its own hormonal instincts of the host and transports the brain of a different owner and get over the fact that basically the people are practically falling in love with themselves and are over the idea that they are interested in someone who looks exactly like them as the movie progresses (not really hard things to get over because it's a movie and genre that is reliant on the suspension of disbelief -- esp. if you liked something as cute and fun as "she's the man") then i think this movie is tremendous with a kind of weak ending (in execution, not in conclusion).

i think this movie is tremendous in moments but i never really laughed. the strength is in the lead actors really and probably the dad of the girl who was pretty cool. the theme of the movie is positive and i guess if you boil things down its all about trust. trust in following the characters, attaching yourselves to them (while knowing the ending) and trust in deciding to leave your brain at the door. i recommend this movie.